annotate svr-session.c @ 1628:ff3f274ea56c

Add missing word to readme (#77)
author Michael Jones <jonesmz@users.noreply.github.com>
date Wed, 20 Mar 2019 08:56:19 -0500
parents 92c93b4a3646
children 76189c9ffea2
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1 /*
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2 * Dropbear - a SSH2 server
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3 *
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4 * Copyright (c) 2002,2003 Matt Johnston
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5 * All rights reserved.
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6 *
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy
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8 * of this software and associated documentation files (the "Software"), to deal
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9 * in the Software without restriction, including without limitation the rights
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10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 * copies of the Software, and to permit persons to whom the Software is
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12 * furnished to do so, subject to the following conditions:
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13 *
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14 * The above copyright notice and this permission notice shall be included in
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15 * all copies or substantial portions of the Software.
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16 *
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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23 * SOFTWARE. */
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24
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25 #include "includes.h"
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26 #include "session.h"
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27 #include "dbutil.h"
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28 #include "packet.h"
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29 #include "algo.h"
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30 #include "buffer.h"
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31 #include "dss.h"
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32 #include "ssh.h"
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33 #include "dbrandom.h"
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34 #include "kex.h"
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35 #include "channel.h"
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36 #include "chansession.h"
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37 #include "atomicio.h"
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38 #include "tcpfwd.h"
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39 #include "service.h"
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40 #include "auth.h"
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41 #include "runopts.h"
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42 #include "crypto_desc.h"
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43 #include "fuzz.h"
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44
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45 static void svr_remoteclosed(void);
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46 static void svr_algos_initialise(void);
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47
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48 struct serversession svr_ses; /* GLOBAL */
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49
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50 static const packettype svr_packettypes[] = {
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51 {SSH_MSG_CHANNEL_DATA, recv_msg_channel_data},
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52 {SSH_MSG_CHANNEL_WINDOW_ADJUST, recv_msg_channel_window_adjust},
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53 {SSH_MSG_USERAUTH_REQUEST, recv_msg_userauth_request}, /* server */
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54 {SSH_MSG_SERVICE_REQUEST, recv_msg_service_request}, /* server */
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55 {SSH_MSG_KEXINIT, recv_msg_kexinit},
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56 {SSH_MSG_KEXDH_INIT, recv_msg_kexdh_init}, /* server */
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57 {SSH_MSG_NEWKEYS, recv_msg_newkeys},
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58 {SSH_MSG_GLOBAL_REQUEST, recv_msg_global_request_remotetcp},
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59 {SSH_MSG_CHANNEL_REQUEST, recv_msg_channel_request},
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60 {SSH_MSG_CHANNEL_OPEN, recv_msg_channel_open},
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61 {SSH_MSG_CHANNEL_EOF, recv_msg_channel_eof},
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62 {SSH_MSG_CHANNEL_CLOSE, recv_msg_channel_close},
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63 {SSH_MSG_CHANNEL_SUCCESS, ignore_recv_response},
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64 {SSH_MSG_CHANNEL_FAILURE, ignore_recv_response},
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65 {SSH_MSG_REQUEST_FAILURE, ignore_recv_response}, /* for keepalive */
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66 {SSH_MSG_REQUEST_SUCCESS, ignore_recv_response}, /* client */
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67 #if DROPBEAR_LISTENERS
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68 {SSH_MSG_CHANNEL_OPEN_CONFIRMATION, recv_msg_channel_open_confirmation},
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69 {SSH_MSG_CHANNEL_OPEN_FAILURE, recv_msg_channel_open_failure},
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70 #endif
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71 {0, NULL} /* End */
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72 };
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73
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74 static const struct ChanType *svr_chantypes[] = {
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75 &svrchansess,
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76 #if DROPBEAR_SVR_LOCALTCPFWD
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77 &svr_chan_tcpdirect,
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78 #endif
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79 NULL /* Null termination is mandatory. */
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80 };
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81
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82 static void
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83 svr_session_cleanup(void) {
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84 /* free potential public key options */
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85 svr_pubkey_options_cleanup();
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86
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87 m_free(svr_ses.addrstring);
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88 m_free(svr_ses.remotehost);
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89 m_free(svr_ses.childpids);
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90 svr_ses.childpidsize = 0;
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91 }
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92
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93 void svr_session(int sock, int childpipe) {
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94 char *host, *port;
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95 size_t len;
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96
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97 common_session_init(sock, sock);
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98
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99 /* Initialise server specific parts of the session */
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100 svr_ses.childpipe = childpipe;
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101 #if DROPBEAR_VFORK
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102 svr_ses.server_pid = getpid();
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103 #endif
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104 svr_authinitialise();
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105 chaninitialise(svr_chantypes);
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106 svr_chansessinitialise();
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107 svr_algos_initialise();
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108
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109 /* for logging the remote address */
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110 get_socket_address(ses.sock_in, NULL, NULL, &host, &port, 0);
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111 len = strlen(host) + strlen(port) + 2;
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112 svr_ses.addrstring = m_malloc(len);
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113 snprintf(svr_ses.addrstring, len, "%s:%s", host, port);
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114 m_free(host);
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115 m_free(port);
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116
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117 get_socket_address(ses.sock_in, NULL, NULL,
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118 &svr_ses.remotehost, NULL, 1);
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119
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120 /* set up messages etc */
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121 ses.remoteclosed = svr_remoteclosed;
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122 ses.extra_session_cleanup = svr_session_cleanup;
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123
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124 /* packet handlers */
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125 ses.packettypes = svr_packettypes;
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126
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127 ses.isserver = 1;
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128
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129 /* We're ready to go now */
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130 ses.init_done = 1;
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131
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132 /* exchange identification, version etc */
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133 send_session_identification();
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134
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135 kexfirstinitialise(); /* initialise the kex state */
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136
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137 /* start off with key exchange */
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138 send_msg_kexinit();
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139
26
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140 /* Run the main for loop. NULL is for the dispatcher - only the client
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141 * code makes use of it */
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142 session_loop(svr_chansess_checksignal);
4
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143
26
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144 /* Not reached */
4
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145
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146 }
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147
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148 /* failure exit - format must be <= 100 chars */
5
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149 void svr_dropbear_exit(int exitcode, const char* format, va_list param) {
1304
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150 char exitmsg[150];
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151 char fullmsg[300];
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152 int i;
4
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153
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154 /* Render the formatted exit message */
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155 vsnprintf(exitmsg, sizeof(exitmsg), format, param);
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156
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157 /* Add the prefix depending on session/auth state */
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158 if (!ses.init_done) {
4
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159 /* before session init */
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160 snprintf(fullmsg, sizeof(fullmsg), "Early exit: %s", exitmsg);
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161 } else if (ses.authstate.authdone) {
4
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162 /* user has authenticated */
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163 snprintf(fullmsg, sizeof(fullmsg),
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a98a2138364a Improve capitalisation for all logged strings
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164 "Exit (%s): %s",
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165 ses.authstate.pw_name, exitmsg);
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
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166 } else if (ses.authstate.pw_name) {
4
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167 /* we have a potential user */
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168 snprintf(fullmsg, sizeof(fullmsg),
1237
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Chocobo1 <Chocobo1@users.noreply.github.com>
parents: 1215
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169 "Exit before auth (user '%s', %u fails): %s",
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170 ses.authstate.pw_name, ses.authstate.failcount, exitmsg);
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171 } else {
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172 /* before userauth */
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173 snprintf(fullmsg, sizeof(fullmsg), "Exit before auth: %s", exitmsg);
4
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174 }
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175
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176 dropbear_log(LOG_INFO, "%s", fullmsg);
4
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177
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178 #if DROPBEAR_VFORK
667
fc7ae88e63b3 Rename HAVE_FORK to USE_VFORK
Matt Johnston <matt@ucc.asn.au>
parents: 666
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179 /* For uclinux only the main server process should cleanup - we don't want
553
8711f20b89ab - For uclinux, only cleanup on exit for the main process. This avoids
Matt Johnston <matt@ucc.asn.au>
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180 * forked children doing that */
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Matt Johnston <matt@ucc.asn.au>
parents: 496
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181 if (svr_ses.server_pid == getpid())
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Matt Johnston <matt@ucc.asn.au>
parents: 496
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182 #endif
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Matt Johnston <matt@ucc.asn.au>
parents: 496
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183 {
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Matt Johnston <matt@ucc.asn.au>
parents: 496
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184 /* must be after we've done with username etc */
733
70811267715c Run the cleanup handler also when we close due to TCP connection being closed
Matt Johnston <matt@ucc.asn.au>
parents: 726
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185 session_cleanup();
553
8711f20b89ab - For uclinux, only cleanup on exit for the main process. This avoids
Matt Johnston <matt@ucc.asn.au>
parents: 496
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186 }
4
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187
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Matt Johnston <matt@ucc.asn.au>
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188 #if DROPBEAR_FUZZ
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189 /* longjmp before cleaning up svr_opts */
1385
6c92e97553f1 Add a flag whether to longjmp, missed that last commit
Matt Johnston <matt@ucc.asn.au>
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diff changeset
190 if (fuzz.do_jmp) {
1348
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191 longjmp(fuzz.jmp, 1);
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192 }
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193 #endif
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194
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Matt Johnston <matt@ucc.asn.au>
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195 if (svr_opts.hostkey) {
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Matt Johnston <matt@ucc.asn.au>
parents: 970
diff changeset
196 sign_key_free(svr_opts.hostkey);
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diff changeset
197 svr_opts.hostkey = NULL;
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Matt Johnston <matt@ucc.asn.au>
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198 }
2b4fd440399d Free memory before exiting. Based on patch from Thorsten Horstmann.
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diff changeset
199 for (i = 0; i < DROPBEAR_MAX_PORTS; i++) {
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
200 m_free(svr_opts.addresses[i]);
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
201 m_free(svr_opts.ports[i]);
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Matt Johnston <matt@ucc.asn.au>
parents: 970
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202 }
2b4fd440399d Free memory before exiting. Based on patch from Thorsten Horstmann.
Matt Johnston <matt@ucc.asn.au>
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203
1347
b28624698130 copy over some fuzzing code from AFL branch
Matt Johnston <matt@ucc.asn.au>
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204
4
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205 exit(exitcode);
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206
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207 }
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208
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209 /* priority is priority as with syslog() */
5
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diff changeset
210 void svr_dropbear_log(int priority, const char* format, va_list param) {
4
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211
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212 char printbuf[1024];
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213 char datestr[20];
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214 time_t timesec;
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215 int havetrace = 0;
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216
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217 vsnprintf(printbuf, sizeof(printbuf), format, param);
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218
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219 #ifndef DISABLE_SYSLOG
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Konstantin Tokarev <ktokarev@smartlabs.tv>
parents: 1139
diff changeset
220 if (opts.usingsyslog) {
4
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221 syslog(priority, "%s", printbuf);
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222 }
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223 #endif
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224
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225 /* if we are using DEBUG_TRACE, we want to print to stderr even if
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226 * syslog is used, so it is included in error reports */
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diff changeset
227 #if DEBUG_TRACE
98
297167ef41bd Fix for printing out things with inetd mode when we have DEBUG_TRACE
Matt Johnston <matt@ucc.asn.au>
parents: 68
diff changeset
228 havetrace = debug_trace;
4
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229 #endif
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230
1215
d058e15ea213 A few minor style fixes
Matt Johnston <matt@ucc.asn.au>
parents: 1210
diff changeset
231 if (!opts.usingsyslog || havetrace) {
404
a588558bfc94 Fix potential null pointer dereference found by Klokwork
Matt Johnston <matt@ucc.asn.au>
parents: 272
diff changeset
232 struct tm * local_tm = NULL;
4
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233 timesec = time(NULL);
404
a588558bfc94 Fix potential null pointer dereference found by Klokwork
Matt Johnston <matt@ucc.asn.au>
parents: 272
diff changeset
234 local_tm = localtime(&timesec);
a588558bfc94 Fix potential null pointer dereference found by Klokwork
Matt Johnston <matt@ucc.asn.au>
parents: 272
diff changeset
235 if (local_tm == NULL
a588558bfc94 Fix potential null pointer dereference found by Klokwork
Matt Johnston <matt@ucc.asn.au>
parents: 272
diff changeset
236 || strftime(datestr, sizeof(datestr), "%b %d %H:%M:%S",
618
b5cc8878d5ec Properly fix the bug found years ago by Klocwork, refound again.
Matt Johnston <matt@ucc.asn.au>
parents: 594
diff changeset
237 local_tm) == 0)
404
a588558bfc94 Fix potential null pointer dereference found by Klokwork
Matt Johnston <matt@ucc.asn.au>
parents: 272
diff changeset
238 {
433
c216212001fc Fix for -pedantic -ansi compilation, change // to /**/, plus some signedness
Matt Johnston <matt@ucc.asn.au>
parents: 404
diff changeset
239 /* upon failure, just print the epoch-seconds time. */
479
e3db1f7a2e43 - Split main socket var into ses.sock_in/ses.sock_out in preparation
Matt Johnston <matt@ucc.asn.au>
parents: 464
diff changeset
240 snprintf(datestr, sizeof(datestr), "%d", (int)timesec);
4
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241 }
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242 fprintf(stderr, "[%d] %s %s\n", getpid(), datestr, printbuf);
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243 }
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244 }
5
bc6477a6c393 syntactical fixups - it compiles, but channel handling code requires fixing.
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parents: 4
diff changeset
245
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parents: 4
diff changeset
246 /* called when the remote side closes the connection */
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Matt Johnston <matt@ucc.asn.au>
parents: 4
diff changeset
247 static void svr_remoteclosed() {
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Matt Johnston <matt@ucc.asn.au>
parents: 4
diff changeset
248
479
e3db1f7a2e43 - Split main socket var into ses.sock_in/ses.sock_out in preparation
Matt Johnston <matt@ucc.asn.au>
parents: 464
diff changeset
249 m_close(ses.sock_in);
1358
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Matt Johnston <matt@ucc.asn.au>
parents: 1355
diff changeset
250 if (ses.sock_in != ses.sock_out) {
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Matt Johnston <matt@ucc.asn.au>
parents: 1355
diff changeset
251 m_close(ses.sock_out);
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Matt Johnston <matt@ucc.asn.au>
parents: 1355
diff changeset
252 }
479
e3db1f7a2e43 - Split main socket var into ses.sock_in/ses.sock_out in preparation
Matt Johnston <matt@ucc.asn.au>
parents: 464
diff changeset
253 ses.sock_in = -1;
e3db1f7a2e43 - Split main socket var into ses.sock_in/ses.sock_out in preparation
Matt Johnston <matt@ucc.asn.au>
parents: 464
diff changeset
254 ses.sock_out = -1;
5
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Matt Johnston <matt@ucc.asn.au>
parents: 4
diff changeset
255 dropbear_close("Exited normally");
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Matt Johnston <matt@ucc.asn.au>
parents: 4
diff changeset
256
bc6477a6c393 syntactical fixups - it compiles, but channel handling code requires fixing.
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parents: 4
diff changeset
257 }
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parents: 4
diff changeset
258
1544
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Matt Johnston <matt@ucc.asn.au>
parents: 1495
diff changeset
259 static void svr_algos_initialise(void) {
d1a8a05216ff make group1 client-only
Matt Johnston <matt@ucc.asn.au>
parents: 1495
diff changeset
260 #if DROPBEAR_DH_GROUP1 && DROPBEAR_DH_GROUP1_CLIENTONLY
d1a8a05216ff make group1 client-only
Matt Johnston <matt@ucc.asn.au>
parents: 1495
diff changeset
261 algo_type *algo;
d1a8a05216ff make group1 client-only
Matt Johnston <matt@ucc.asn.au>
parents: 1495
diff changeset
262 for (algo = sshkex; algo->name; algo++) {
d1a8a05216ff make group1 client-only
Matt Johnston <matt@ucc.asn.au>
parents: 1495
diff changeset
263 if (strcmp(algo->name, "diffie-hellman-group1-sha1") == 0) {
d1a8a05216ff make group1 client-only
Matt Johnston <matt@ucc.asn.au>
parents: 1495
diff changeset
264 algo->usable = 0;
d1a8a05216ff make group1 client-only
Matt Johnston <matt@ucc.asn.au>
parents: 1495
diff changeset
265 }
d1a8a05216ff make group1 client-only
Matt Johnston <matt@ucc.asn.au>
parents: 1495
diff changeset
266 }
d1a8a05216ff make group1 client-only
Matt Johnston <matt@ucc.asn.au>
parents: 1495
diff changeset
267 #endif
d1a8a05216ff make group1 client-only
Matt Johnston <matt@ucc.asn.au>
parents: 1495
diff changeset
268 }
d1a8a05216ff make group1 client-only
Matt Johnston <matt@ucc.asn.au>
parents: 1495
diff changeset
269